Sludge-filled gallbladder

Canine gallbladder mucocele (GBM) is an emerging biliary disease in dogs described as the excessive and abnormal accumulation of thick, gelatinous mucus in the lumen, which results in an enlarged gallbladder. GBMs have been diagnosed more frequently in comparison to prior to the 2000s when it was considered rare. [Source: Wikipedia ]

Hepatization of gallbladder
May Cause
Nonvisualization of gallbladder